70. The number of symmetry planes in a cube is
(a) 3
(b) 6
(d) 12
c) 9
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Nine Planes
The Nine Planes of Symmetry of the Cube and/or Octahedron
It contains two different types of symmetry planes: three of the planes are orthogonal to the three 4-fold symmetry axes; each such plane is parallel to, and halfway between, two opposite faces of the cube; these three planes are mutually orthogonal.
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